ULTRATHIN CLAY-CONTAINING LAYER-BY-LAYER SEPARATOR COATING ENHANCES PERFORMANCE OF LITHIUM-SULFUR BATTERIES

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dc.contributor.authorMentbayeva, Almagul
dc.contributor.authorSukhishvili, Svetlana
dc.contributor.authorNaizakarayev, Miras
dc.contributor.authorBatyrgali, Nursaule
dc.contributor.authorSeitzhan, Zhanar
dc.contributor.authorBakenov, Zhumabay
dc.date.accessioned2021-01-25T04:18:25Z
dc.date.available2021-01-25T04:18:25Z
dc.date.issued2021-01-10
dc.description.abstractDissolution of polysulfides upon cycling of the sulfur cathode and their diffusion through the separator membrane ā€’ the shuttle effect ā€’ is a major factor which deteriorates performance and safety of lithium-sulfur (Li-S) batteries. Here, ultrathin, light-weight polyelectrolyte-clay layer-by-layer assemblies have been developed as versatile nanocoatings on the polypropylene (PP) separator to suppress the shuttle effect. The use of weak polyelectrolytes (polyethyleneimine, PEI, and polyacrylic acid, PAA) and montmorillonite (MMT) or halloysite (Hal) clay nanoparticles enabled full control over mass and charge balance of polyelectrolyte/clay film components, which was critical for achieving ion selectivity and reduction of the polysulfide diffusion. The differences in the geometry and structure of MMT and Hal (nanoplatelets vs. nanotubes), as well as in the pH-controlled charge density of PEI and PAA greatly affected the thickness, morphology, and the ultimate performance of the nanocoatings. In particular, deposition of 450 nm MMT-based coatings at pH 3 and 6 lead to an increase in electrolyte uptake, delayed the lithium dendrite growth and enhanced the discharge capacity of the cell from 300 mAh gāˆ’1 for bare to 690 mAh gāˆ’1 for coated PP separator over 200 charge-discharge cycles 0.5 C. At the same time, 250 nm-thick Hal-based coatings deposited at pH 3 resulted in an increase in the Coulombic efficiency from 50% for the bare PP separator to ~99% for the coated one, showing an outstanding performance. Additionally, the polyelectrolyte-clay nanocoatings significantly improve thermal and dimensional stability of the PP separator. The results demonstrate that ultrathin LbL clay-containing coatings on the PP separator membrane can drastically improve the cyclability of the Li-S cells.en_US
dc.identifier.citationMentbayeva, A., Sukhishvili, S., Naizakarayev, M., Batyrgali, N., Seitzhan, Z., & Bakenov, Z. (2021). Ultrathin clay-containing layer-by-layer separator coating enhances performance of lithium-sulfur batteries. Electrochimica Acta, 366, 137454. https://doi.org/10.1016/j.electacta.2020.137454en_US
dc.identifier.issn0013-4686
dc.identifier.urihttps://doi.org/10.1016/j.electacta.2020.137454
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0013468620318478?via%3Dihub
dc.identifier.urihttp://nur.nu.edu.kz/handle/123456789/5216
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.ispartofseriesElectrochimica Acta;Volume 366, 10 January 2021, 137454
dc.rightsAttribution-NonCommercial-ShareAlike 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/3.0/us/*
dc.subjectLithium-sulfur batteriesen_US
dc.subjectPolysulfide shuttleen_US
dc.subjectHalloysiteen_US
dc.subjectLayer-by-layer assemblyen_US
dc.subjectLithium dendriteen_US
dc.subjectResearch Subject Categories::TECHNOLOGYen_US
dc.titleULTRATHIN CLAY-CONTAINING LAYER-BY-LAYER SEPARATOR COATING ENHANCES PERFORMANCE OF LITHIUM-SULFUR BATTERIESen_US
dc.typeArticleen_US
workflow.import.sourcescience

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